官网的信息如下：关于退票：Electronic ticket refund Purchased electronic tickets are not subject to refund. A passenger can be given a full refund on his/her ticket, if Aeroexpress trains have not travelled for more than one hour, due to an unscheduled maintenance break. In all other cases, no refunds shall be made for single tickets that have not been used (in accordance with the Conditions of Rail Carriage for Passengers and Cargo, Baggage, and Cargo Luggage, Transported for Personal, Family and Other Needs Not of a Business Character’, approved by Order No.111, issued by the government of the Russian Federation on 2 March 2005). 也就是说，如果你已经订票了，除了机场快轨1个小时以上都没有开车可以全额退款以外，其他情况不予退票。关于日期的更改：Electronic ticket change When purchasing an e-ticket, ticket parameters may be changed only once. Please note that these changes may be done in the User Account on the Aeroexpress website only after you have previously registered on/logged into the website. If you have not registered on/logged into the Aeroexpress website, you may change e-ticket parameters via our Hotline at +7-800-700-33-77. It is only possible to change the parameters for standard and round-trip fares before the expiry date shown on the ticket. In the case that the ticket has been purchased on the departure date, e-ticket details may only be changed on that particular day. Business class e-ticket details may be changed not later than 30 minutes before the departure time indicated on the ticket. Up to ten tickets, at the same fare, may be bought simultaneously. If the trip parameters have been changed, updated information will be applied to all tickets in one order.订票必须选择日期，且只能用在票面日期，如果你想改签，那么日期只能在出发前被更改一次（你必须创建网站账户才可以），且必须是更改票上的日期之前的日期，因为过了票上的日期就是过期票了。所有关于机场快轨的policy请看这里：https://aeroexpress.ru/en/aero/help.html#passwordRecovery